This is in no paticular order, but…
Why is this not here?
Monolorhino: Ceramgnus is now the new best swap in damage. 1500 armor piercing, group accelleration, precise rampage, this is a swap in who can take out the likes of mortem rex, magna, tryko in mindgames, and many more top tiers. Monolorhino doesn’t compare in 1v1, but when resistances come into play when it matters (such as against grypo) lorhino can do some good. Overall, in my opinion, Ceranagnus is better. I’d say a top 12, to be fair. Being replaced like that rises more uniques in your place.
Thylacotator: While it is good, it is still easy to counter via a magna or quetz swap. It is more of a top 15 in my eyes.
Maxima: Still a worse gemini. 30% crit is NOT reliable, and the health buff doesn’t exactly help it. Again, makes the top 15.
Mortem Rex: Too easy to counter. Beaten by the sloth, smilodon, pyroraptor, magna, ceramagnus, hadros lux, gemini, lania, thor, indo, and a whole lot of stuff. Maybe a top tier when it comes to boosts, but WAY underpowered compared to hadros and magnus.
Quetzorion: Makes it here because Monolorhino was completely thrown off. It no longer holding the title of best swap in creature in the game brings quetzorion to my list, with its only reliable counter being geminititan, everything else fails miserably or gets bullied.
Mammolania: A strong unique who can annoy you for long periods without diorajasaur or trykosaurus, even magna and quetzorion, it’s sure to even solo a whole team if you can’t pierce its armor.
Erlikospyx: 20% crit with two 3000 damage rampages on revenge is mega-powerful. Can beat tryko in mindgames, owns every other unique cunning besides erlidom and quetzorion, and has a reliable speed advantage move, minimal speedup strike, which unlike the prioritized sidestep, can help it gain speed advantages over things like faster magnas.
That’s basically my list.